Opposed-piston engine



April 3, 1945. w. KILCHENMANN 2,372,576"

oPPosEp-PISTON ENGINE Filed VJuly 7, 1942 2 Ashams-Smm 1 A TT ORNE YS April 3, 1945'. w. KILCHENMANN 2,372,676

OPPOSED-PISTON ENGINE y l Filed July 7, 1942 2 Sheets-.Sheet 2 A TTORNE Ys 4 I2 through the toothed wheels I'I and II-.

the other hand the output of the turbine I3 is not Patented Apr. 3, 1945 'PPOSED-PISTON ENGINE Walter Kilchenmann, Winterthur, Switzerland, assigner to Sulzer Frres, Socit Anonyme,

Winterthur, Switzerland i Application July 7, 1942, Serial No. 449,994

In Switzerland November 20, 1941 3 Claims.

The invention relates to a two-shaft opposedpiston internal combustion engine with exhaust gas turbine and turbo compressor, which are all coupled, by a reduction gear bridging over the -difference in speeds, to the central gear connect ing the crankshafts. The invention consists in each rotary machine being connected through a separate toothed wheel to the reduction gear in such a way that each of these machines runs at the speed which is most favourable for it. Preferably the speed-reduction gear is connected to an intermediate Wheel of the central gear arranged between the crankshafts, this interme- (ol. lso-13) diate wheel having a smaller diameter than the l other toothed wheels of the central gear.

Two examples of execution according to the invention are shown in a simplified manner in Figs. 1 and 2 of the drawings. i

The pistons I and 2 of the engine according to Fig. 1 drive, through connecting rods 3 and 4 and cranks 5 and 6, the shafts 'd and 8, The out# put of these shafts is transmitted by means of the pinions 9 and IIJ and the toothed wheel H of a central gear to the main shaft I2. turbine I3 and an axial compressor I4 are coupled, by a reduction gear bridging over the diiference in speeds, to the central gear connecting the crankshafts I and 8.

In mesh with the toothed Wheel II of the cenon the same shaft as a toothed Wheel IB. With the Wheel I8 mesh on the onehand 'the toothed wheel I9 of the turbine I3 and on the other hand the toothed wheel of the compressor I4. The wheels I9 and 20 are of such dimensions that both the turbine and the compressor I4 can run 'at their most favourable speeds.

The output of the turbine I3 is first of all transmitted through toothed wheel I9 to toothed wheel I8, whilst the compressor I4 is driven through the toothed wheel 20 from the same toothed wheel I8. If the power given up at the turbine is greater than the power .required at the compressors, the excess powery is transmitted to the main shaft If on An exhaust.

valone suflicient to drive the compressor I4, the

power still required is received from the main shaft I2 through the toothed Wheels II, I'I and I8.

The crankshafts 1' and 8 of the engine according to Fig. 2 are connected to each other through the toothed wheels 2I, 22, 23 'and 24 of the central gear. Among these toothed wheels the smallest one 22 isv connected to a toothed Wheel 2E through a shaft 25 which is designed as a torsion spring shaft. This toothed wheel 26 is in mesh on the one hand with the toothed Wheel I9 of the exhaust gas turbine I3 and on the other hand with the toothed wheel 20 of the compressor I4. The toothed Wheels I9 and 20 are of such diameters that the turbine and the compressor can run at their most favourable speeds.

Instead of a rotary compressor, a centrifugal compressor can equally well be adopted.

I claim:

1. The combination with a two-shaft internal combustion enginev which comprises a gear connected to and driven by each crankshaft, a third gear connected to and driven by each of the aforementioned gears, a fourth gear connected to the third gear, a ith gear on the same shaft with the fourth gear, an exhaust gas turbine connected by a sixth gear to the fifth gear, and a compressor connected by a seventh gear to the fifth gear, said sixth and seventh gears being so proportioned with respect to the fifth gear that the exhaust gas turbine and the compressor each run at the most favorable speeds.

larger in diameter than the gears connected to each crankshaft, the fifth gear being larger in diameter than the fourth -gear and arranged to drive the fourth gear, the sixth and seventh gears each being smaller in diameter than the fth gear I whereby the turbine and the compressor each run at greater speeds than the fifth gear.

WALTER mcHENMANN. 

